Backstory:

Sans had a brother, Papyrus, but however, he made a deal with a psychopath, and he was not seem like a good idea, in the regretfully decision, he killed the white dog on the road and he feels it, he feels the predatory and sadism on the inside.

His first environment on the company that annihilates further, he accidentally stumbled upon a torture chamber where he witnessed his friends got tortured by a genocidal, he smiled at the very end a began finishing the genocidals job by killing his friends and even his own brother with a toy knife before he picked up after he betrays the humankind.

He was officially in a member of this company.

He got hit from his own right eye by a taser, causing an injury to those seeing things.

He was a inspiration of Rinny.